#include <iostream>
using namespace std;

class A {
  private:
    int n;

  public:
    A(int n) { this->n = n; } // 将数据成员n初始化为形参n
    void Show() const { cout << n << endl; }
};

int main() {

    A i = 8;
    i.Show();

    return 0;
}
